I have a pair of light weight, flexible, waterproof shoes that I like for
hiking through the woods. They are good for level and uphill hiking. But on
long downhill stretches of trail my foot slides forward with each step and the end of my toes hit against the front of the shoe. It doesn't take long for that to be painful. They are a slip on, all rubber shoe or boot with the tops about
ankle high. The lace area is stretchy enough that my foot is not stopped from
sliding forward. So I bent some clotheshanger wire to fit in one of the tread
grooves near the heal of the shoe. I put a large loop at each end of the wire
so a piece of bicyle tire inner tube could be run through the loops. I put everthing in place, stretched the inner tube tight and made a square knot to
secure it in place. It works well. No more sore toes. The wire stays in the tread groove amazingly well. I leave the knot tied. When putting the shoe on, the wire/strap is slipped on first to well above the ankle before the shoe is put on. Then once I got the hang of it, it became easy to push the wire into
place under the shoe's heel.

Doing a lot of keying on a laptop computer causes the hands to hurt and tires the neck and eyes. You can't look straight ahead. You look down at the screen. Sit the laptop on a table and your wrists have to be bent to align with the keyboard. To keep your wrist straight the keyboard has to be much lower. Put the keyboard lower and your gaze becomes even more downward. It makes you want to lean over, then the back starts hurting.

I came up with a partial solution that helps a lot. I made a wedge shaped base that is placed under the laptop. Then the keyboard is at an angle so the wrists don't have to be bent, even with the laptop sitting on a high table or countertop.

I made the structure by cutting the shape shown below from corrugated cardboard from a grocery store box. A piece of clotheshanger wire was used to reinforce the structure. The red lines in the picture below marks the fold lines. I pressed a drywall trowel edge into the cardboard at each fold to force the fold to form were it should. White glue holds all the overlapped areas which were held together with weights until the glue dried.

This is the shape needed for the cardboard cutout.

The two ends are lapped. The wire is put in place before applying glue. It is placed between layers.

The finished laptop base.

The keyboard is at the same angle as the line of the arm and hands when the laptop sits on a table and the operator is sitting in a chair.